Dual Battery?
 

I am going to be installing a 2nd battery in my 4Runner. Where are you guys and girls putting your 2nd battery? Underhood, in the back? Show some pics, please thanks!


HDHP

I moved the starting battery to the rear pass corner, then installed the house battery in the original spot (need the space to accommodate a group 31M battery). Used an Off-grid engineering battery mount in the back and a Pelfreybilt I had from my 16 Tacoma for the front. Both batteries are AGM and I use a DC to DC charger for the house battery.

I can't take any credit for it, but here's a very detailed explanation of the dual AGM setup that's in my truck. The PO did a great job and I love it.

https://www.toyota-4runner.org/3255206-post10.html

Thanks for the link. That's a great setup, I'll have to follow that when I get around to doing mine.

I have plans to update the dual battery for the purpose of making improvements, but as of now here is how it sits:

My parts list can be found in this thread:
Toyota 4Runner Forum - Largest 4Runner Forum - View Single Post - Questions: Dual Bat setup and Power Distribution block from Shrock

https://i.imgur.com/f10ARDO.jpg?1

https://i.imgur.com/Tmc1JBB.jpg?1

https://i.imgur.com/crUmrTu.jpg

https://i.imgur.com/y8TAqKm.jpg


I have started working on a triple battery setup now... with the fridge having its own dedicated 24 volt lithium battery in the back which charges off the dual battery using a DC to DC converter. I really need to do a write up on it because I have been wanting to share that but been busy. Its built out of 18650 batteries and last about for 2.5 days without any supplemental charge from alternator.

https://i.imgur.com/WIMFEZY.jpg?1

https://i.imgur.com/x976IBN.jpg?1

I have been thinking of doing a duel battery set up as well. But was contemplating of doing a lithium battery to run much longer.

Yes, you get a lot more usable power and much better power density. The same job can be done in a much smaller and lighter package when compared to lead.

All this lithium battery stuff is kind of my thing… been working with them for many years. I am more than happy to help if you want someone to bounce ideas off of.

Any experience of dual battery set-up in south american markets?
 

Following / reviving thread for more experiences - esp. from south american markets if anyone is there ! (different engine set-up it seems)

Cheers!


---------------------------
2005 4Runner SR5

Bumbo,
Do you have a full write up on the hardware and components used to make the 18650 power setup for your fridge?

I have plans to make something, but I haven't got around to it yet. I also have a couple different designs I want to share which are specific to the 4Runner and that is still under development. I have moved away from the PCB (circuit board) style setup now that I have a spot welder to make packs.

In it's most basic form, it's 3 primary components if you want to research them individually.

• Lithium Battery
• BMS (Battery Management System for monitoring and saftey)
• Adjustable DC-DC Converter / Charger

I'll have more information on these items in the future. I have kicked around some ideas in video, but have yet to follow it up with something more complete about the 4Runner setup.

ARB Fridge Startup - Lithium Battery PCB Load Test - YouTube
18650 Battery Pack - YouTube

Bluetooth BMS Testing / Hardware
18650 Battery Board BMS Testing Setup - YouTube

DC-DC Charger (used to charge from alternator)
Orion-Tr DC-DC Converters Isolated - Victron Energy

Optional Solar
SmartSolar MPPT 75/10, 75/15, 100/15 & 100/20 - Victron Energy

Eventually ill have something more complete for this 4Runner community... My intent wasn't to make an instructional, but ill try and include as much info as possible.

Thank you for sharing.